Enhanced thermal conductivity of ethylene glycol with single-walled carbon nanotube inclusions

Harish Sivasankaran, Kei Ishikawa, Erik Einarsson, Shinya Aikawa, Shohei Chiashi, Junichiro Shiomi, Shigeo Maruyama

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

In the present work, we report measurements of the effective thermal conductivity of dispersions of single-walled carbon nanotube (SWNT) suspensions in ethylene glycol. The SWNTs were synthesized using the alcohol catalytic chemical vapour deposition method. Resonant Raman spectroscopy was employed to estimate the diameter distribution of the SWNTs based on the frequencies of the radial breathing mode peaks. The nanofluid was prepared by dispersing the nanotubes using a bile salt as the surfactant. Nanotube loading of up to 0.2 vol% was used. Thermal conductivity measurements were performed by the transient hot-wire technique. Good agreement, within an uncertainty of 2%, was found for published thermal conductivities of the pure fluids. The enhancement of thermal conductivity was found to increase with respect to nanotube loading. The maximum enhancement in thermal conductivity was found to be 14.8% at 0.2 vol% loading. The experimental results were compared with literature results in similar dispersion medium. Experimental results were compared with the Hamilton-Crosser model, the Lu-Lin model, Nan's effective medium theory and the Hashin-Shtrikman model. Effective medium theory seems to predict the thermal conductivity enhancement reasonably well compared to rest of the models. Networking of nanotubes to form a tri-dimensional structure was considered to be the reason for the thermal conductivity enhancement.

Original languageEnglish
Pages (from-to)3885-3890
Number of pages6
JournalInternational Journal of Heat and Mass Transfer
Volume55
Issue number13-14
DOIs
Publication statusPublished - Jun 1 2012

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Ethylene Glycol
Single-walled carbon nanotubes (SWCN)
Ethylene glycol
glycols
Thermal conductivity
ethylene
thermal conductivity
carbon nanotubes
inclusions
Nanotubes
nanotubes
augmentation
dispersing
breathing
Bile Acids and Salts
Dispersions
Surface-Active Agents
Raman spectroscopy
Chemical vapor deposition
Suspensions

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

Enhanced thermal conductivity of ethylene glycol with single-walled carbon nanotube inclusions. / Sivasankaran, Harish; Ishikawa, Kei; Einarsson, Erik; Aikawa, Shinya; Chiashi, Shohei; Shiomi, Junichiro; Maruyama, Shigeo.

In: International Journal of Heat and Mass Transfer, Vol. 55, No. 13-14, 01.06.2012, p. 3885-3890.

Research output: Contribution to journalArticle

Sivasankaran, Harish ; Ishikawa, Kei ; Einarsson, Erik ; Aikawa, Shinya ; Chiashi, Shohei ; Shiomi, Junichiro ; Maruyama, Shigeo. / Enhanced thermal conductivity of ethylene glycol with single-walled carbon nanotube inclusions. In: International Journal of Heat and Mass Transfer. 2012 ; Vol. 55, No. 13-14. pp. 3885-3890.
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